Introduce command check-mailmap, similar to check-attr and check-ignore,
which allows direct testing of .mailmap configuration.

As plumbing accessible to scripts and other porcelain, check-mailmap
publishes the stable, well-tested .mailmap functionality employed by
built-in Git commands.  Consequently, script authors need not
re-implement .mailmap functionality manually, thus avoiding potential
quirks and behavioral differences.

Signed-off-by: Eric Sunshine <sunsh...@sunshineco.com>
---
 .gitignore                             |  1 +
 Documentation/git-check-mailmap.txt    | 47 ++++++++++++++++++++++++
 Makefile                               |  1 +
 builtin.h                              |  1 +
 builtin/check-mailmap.c                | 66 ++++++++++++++++++++++++++++++++++
 command-list.txt                       |  1 +
 contrib/completion/git-completion.bash |  1 +
 git.c                                  |  1 +
 8 files changed, 119 insertions(+)
 create mode 100644 Documentation/git-check-mailmap.txt
 create mode 100644 builtin/check-mailmap.c

diff --git a/.gitignore b/.gitignore
index efa8db0..6b1fd1b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@
 /git-cat-file
 /git-check-attr
 /git-check-ignore
+/git-check-mailmap
 /git-check-ref-format
 /git-checkout
 /git-checkout-index
diff --git a/Documentation/git-check-mailmap.txt 
b/Documentation/git-check-mailmap.txt
new file mode 100644
index 0000000..39028ee
--- /dev/null
+++ b/Documentation/git-check-mailmap.txt
@@ -0,0 +1,47 @@
+git-check-mailmap(1)
+====================
+
+NAME
+----
+git-check-mailmap - Show canonical names and email addresses of contacts
+
+
+SYNOPSIS
+--------
+[verse]
+'git check-mailmap' [options] <contact>...
+
+
+DESCRIPTION
+-----------
+
+For each ``Name $$<user@host>$$'' or ``$$<user@host>$$'' from the command-line
+or standard input (when using `--stdin`), look up the person's canonical name
+and email address (see "Mapping Authors" below). If found, print them;
+otherwise print the input as-is.
+
+
+OPTIONS
+-------
+--stdin::
+       Read contacts, one per line, from the standard input after exhausting
+       contacts provided on the command-line.
+
+
+OUTPUT
+------
+
+For each contact, a single line is output, terminated by a newline.  If the
+name is provided or known to the 'mailmap', ``Name $$<user@host>$$'' is
+printed; otherwise only ``$$<user@host>$$'' is printed.
+
+
+MAPPING AUTHORS
+---------------
+
+include::mailmap.txt[]
+
+
+GIT
+---
+Part of the linkgit:git[1] suite
diff --git a/Makefile b/Makefile
index 0600eb4..ef442eb 100644
--- a/Makefile
+++ b/Makefile
@@ -912,6 +912,7 @@ BUILTIN_OBJS += builtin/bundle.o
 BUILTIN_OBJS += builtin/cat-file.o
 BUILTIN_OBJS += builtin/check-attr.o
 BUILTIN_OBJS += builtin/check-ignore.o
+BUILTIN_OBJS += builtin/check-mailmap.o
 BUILTIN_OBJS += builtin/check-ref-format.o
 BUILTIN_OBJS += builtin/checkout-index.o
 BUILTIN_OBJS += builtin/checkout.o
diff --git a/builtin.h b/builtin.h
index 1ed8edb..8afa2de 100644
--- a/builtin.h
+++ b/builtin.h
@@ -40,6 +40,7 @@ extern int cmd_checkout(int argc, const char **argv, const 
char *prefix);
 extern int cmd_checkout_index(int argc, const char **argv, const char *prefix);
 extern int cmd_check_attr(int argc, const char **argv, const char *prefix);
 extern int cmd_check_ignore(int argc, const char **argv, const char *prefix);
+extern int cmd_check_mailmap(int argc, const char **argv, const char *prefix);
 extern int cmd_check_ref_format(int argc, const char **argv, const char 
*prefix);
 extern int cmd_cherry(int argc, const char **argv, const char *prefix);
 extern int cmd_cherry_pick(int argc, const char **argv, const char *prefix);
diff --git a/builtin/check-mailmap.c b/builtin/check-mailmap.c
new file mode 100644
index 0000000..8f4d809
--- /dev/null
+++ b/builtin/check-mailmap.c
@@ -0,0 +1,66 @@
+#include "builtin.h"
+#include "mailmap.h"
+#include "parse-options.h"
+#include "string-list.h"
+
+static int use_stdin;
+static const char * const check_mailmap_usage[] = {
+N_("git check-mailmap [options] <contact>..."),
+NULL
+};
+
+static const struct option check_mailmap_options[] = {
+       OPT_BOOL(0, "stdin", &use_stdin, N_("also read contacts from stdin")),
+       OPT_END()
+};
+
+static void check_mailmap(struct string_list *mailmap, const char *contact)
+{
+       const char *name, *mail;
+       size_t namelen, maillen;
+       struct ident_split ident;
+
+       if (split_ident_line(&ident, contact, strlen(contact)))
+               die(_("unable to parse contact: %s"), contact);
+
+       name = ident.name_begin;
+       namelen = ident.name_end - ident.name_begin;
+       mail = ident.mail_begin;
+       maillen = ident.mail_end - ident.mail_begin;
+
+       map_user(mailmap, &mail, &maillen, &name, &namelen);
+
+       if (namelen)
+               printf("%.*s ", (int)namelen, name);
+       printf("<%.*s>\n", (int)maillen, mail);
+}
+
+int cmd_check_mailmap(int argc, const char **argv, const char *prefix)
+{
+       int i;
+       struct string_list mailmap = STRING_LIST_INIT_NODUP;
+
+       git_config(git_default_config, NULL);
+       argc = parse_options(argc, argv, prefix, check_mailmap_options,
+                            check_mailmap_usage, 0);
+       if (argc == 0 && !use_stdin)
+               die(_("no contacts specified"));
+
+       read_mailmap(&mailmap, NULL);
+
+       for (i = 0; i < argc; ++i)
+               check_mailmap(&mailmap, argv[i]);
+       maybe_flush_or_die(stdout, "stdout");
+
+       if (use_stdin) {
+               struct strbuf buf = STRBUF_INIT;
+               while (strbuf_getline(&buf, stdin, '\n') != EOF) {
+                       check_mailmap(&mailmap, buf.buf);
+                       maybe_flush_or_die(stdout, "stdout");
+               }
+               strbuf_release(&buf);
+       }
+
+       clear_mailmap(&mailmap);
+       return 0;
+}
diff --git a/command-list.txt b/command-list.txt
index bf83303..08b04e2 100644
--- a/command-list.txt
+++ b/command-list.txt
@@ -13,6 +13,7 @@ git-bundle                              mainporcelain
 git-cat-file                            plumbinginterrogators
 git-check-attr                          purehelpers
 git-check-ignore                        purehelpers
+git-check-mailmap                       purehelpers
 git-checkout                            mainporcelain common
 git-checkout-index                      plumbingmanipulators
 git-check-ref-format                    purehelpers
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index fa3ae1e..cd509a5 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -648,6 +648,7 @@ __git_list_porcelain_commands ()
                cat-file)         : plumbing;;
                check-attr)       : plumbing;;
                check-ignore)     : plumbing;;
+               check-mailmap)    : plumbing;;
                check-ref-format) : plumbing;;
                checkout-index)   : plumbing;;
                commit-tree)      : plumbing;;
diff --git a/git.c b/git.c
index 4359086..02c3035 100644
--- a/git.c
+++ b/git.c
@@ -324,6 +324,7 @@ static void handle_internal_command(int argc, const char 
**argv)
                { "cat-file", cmd_cat_file, RUN_SETUP },
                { "check-attr", cmd_check_attr, RUN_SETUP },
                { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE 
},
+               { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
                { "check-ref-format", cmd_check_ref_format },
                { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
                { "checkout-index", cmd_checkout_index,
-- 
1.8.3.2.804.g0da7a53

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